Mail stacking device



FIG. 1 is a front and right perspective view of the mail stacking device showing my new design.

FIG. 2 is a right side elevational view thereof, the left side elevational view being a mirror image.

FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image.

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a mail stacking device, as shown and described. 